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@uiten tat gatmt @High STOP VALVES FOR STEAM PIPES.

GEORGE E. WHITMCRE, CF HCUSATCNIC, MASSACHUSETTS, ASSIGNCR TC SELF ANDE. S. IIXLEY, CF SAME PLACE.

Letters Patent No. 59,752, dated November 20, 1866.

S PECIFICATION. TO ALL WHOM IT MAY CONCERN Be it known that I,' GEORGEE. WHITMORE,O` Housatonic, in the county of Berkshire, and State of Mas-Y sachusetts, have invented a new and improved steam cock, and I dohereby declare the following to be a full and exact descriptionthereof-reference being had to the accompanying drawings and to lettersand figures marked thereon: v l The nature of my invention is animproved steam cock, which is cheap, durable, and effective, and removessome of the objectionsto steam cocks now in use.

Fig. 1 represents a half section of the steam cock cut lengthwise, inwhich the sliding valve A is shown in the barrel of the cock B B B B,showing the valve stem C C and the crank pin D, which, when turned inthe slot E of' the valve A, forces the valve A up against and into thevalve seat F F, thus closing the orifice through which the steam passes.

C C is the valve stem.

G G is the ground joint at inside end of valve stem C C.

H H is a lead ring or its equivalent at outside end of valve stem C C,which forms a durable and eicient packing for lvalve stem C C, toprevent leakage of steam.

l I I is a choke plug, which is cast on or otherwise secured to thevalve A, which passes into the orifice through which the steam passes invalve seat F F, choking the steam back when but little is required, sothat the cutting of steani when passing is on the choke plug I I, andnot on the valve A or valve seat F F. Fig. 2 represents the inside endof valve stem C C and crank pin D, where it connects with valve A.

Fig. 3 is a side view of the sliding valve A, showing the slot E inwhich the crank pin D moves in opening and closing valve A.

Fig. 4 is an end view of the sliding valve A, showing the flanges whichhold it in place in the barrel B B B B, and allow free passage of steamwhen open.

Fig. 5 represents the cock in its finished state.

What I claim'as my invention and desire to secure by Letters Patent, is

rlhe eccentric pin in combination with the valve stem for forcing thevalve A against and into the valve seat F F. I also claim the chokeplugI I, Whichprevents the valve A and valve seat F F from being worn bythe action of the steam in passing between the valve A and valve seat FF. I also claim the arrangement of the ground joint G G at the insideend of Valve stem C C and lead ring H H or equivalent at outside end ofn valve stem C C, which forms a doublepacking. Y And the combination ofall these parts in the manner and for the purpose specified. GEO. E.WHITMORE.

Witnesses A. D. WHITMORE, A. BROOKS.

